Slot aerodynamic journal bearing

Abstract

The invention discloses a slot aerodynamic journal bearing which comprises a bearing outer race and a bearing inner race. Slot patterns with regular shapes are arranged on the external circumference surface and the two end surfaces of the bearing inner race; the slot patterns on the two end surfaces are in mirror symmetry; and an axial contour line of the slot pattern on the external circumference surface is in one-to-one correspondence and is connected with radial contour lines of the slot patterns on the two end surfaces. The slot aerodynamic journal bearing can achieve 1-3kg loading capacity and 200,000-450,000rpm limit speed and meet the application of the aerodynamic journal bearing in the ultrahigh speed field under a higher load.

Description

technical field [0001] The invention relates to a dynamic pressure gas radial bearing, in particular to a groove type dynamic pressure gas radial bearing, which belongs to the technical field of gas bearings. Background technique [0002] Gas bearings have the advantages of high speed, high precision, high temperature resistance, small friction loss, and long life. After rapid development in recent decades, gas bearings have been widely used in high-speed bearings, high-precision bearings and other fields. At present, various types of gas bearings have been developed, mainly divided into dynamic pressure type and static pressure type. [0003] The dynamic pressure gas bearing uses gas as a lubricant to form an air film between the shaft and the bearing. It is a bearing form in which the moving surface and the static surface do not directly contact. It has the characteristics of no pollution, low friction loss, wide temperature range, stable operation, Long service life, hig...

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Problems solved by technology

[0005] The tilting pad type dynamic pressure gas radial bearing is a kind of dynamic pressure gas bearing with excellent performance. The processing accuracy is easy to be guaranteed, and it also has the outstanding advantage of "automatic tracking" of load changes. At present, it is mainly used in large-scale high-speed rotating machinery and turbo machinery at home and abroad; Bearing requirements are high, which limits its application

[0006] Although the foil type dynamic pressure gas radial bearing has elastic support, which can make the bearing obtain a certain bearing capacity and the ability to moderate shock vibration, but because the foil bearing generally uses metal foil, not only the material manufacturing technology and processing technology There are still some technical problems, and the damping value of the bearing cannot be greatly improved, resulting in insufficient rigidity of the bearing, low critical speed of the bearing, and easy instability or even jamming when running at high speed

[0007] The groove-type dynamic pressure gas radial bearing has better stability, even under no-load conditions, especially at high speeds, its static load capacity is larger than other types of bearings; but the existing groove Type dynamic pressure gas radial bearings can only achieve a load capacity of 0.5-1.5kg and a limit speed of 100,000-200,000rpm at present, which cannot meet the application of ultra-high-speed applications under relatively large loads

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